stylesheet not work when xmlns exist

I am on xlst 1.0,

This is my stylesheet,

	<xsl:template match="/Request">
	<data>
	<Elem n="{name(.)}">
	<xsl:for-each select="@*">
	<xsl:if test="name(.)='System'">
		<attr n="{name(.)}">
		<xsl:element name="val">
			<xsl:attribute name="s">
				<xsl:value-of select="normalize-space(.)"/>
			</xsl:attribute>
		</xsl:element>
		</attr>
	</xsl:if>
	</xsl:for-each>
	<xsl:apply-templates/>
	</Elem>
	</data>
	</xsl:template>

I only want to get the "System" attribute and ignore all the rest.
The stylesheet works perfectly fine and generate following output-1
when I use input-1 and input-2 as below.

input-1:
<?xml version="1.0" encoding="UTF-8"?>
<Request xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="abc.xsd" System="mysystem">
</Request>

input-2:
<?xml version="1.0" encoding="UTF-8"?>
<Request abc="myabc" System="mysystem">
</Request>

output-1:
<?xml version="1.0" encoding="utf-8"?>
<data>
   <Elem n="Request">
      <attr n="System">
         <val s="mysystem"/>
      </attr>
   </Elem>
</data>


THE PROBLEM arise when the input is with xmlns without prefix "xsi",
the output that is output-3 as below:

input-3: Remove the xsi prefix from xmlns
<?xml version="1.0" encoding="UTF-8"?>
<Request xmlns="http://www.abc.com"  System="mysystem">
</Request>

output-3:
<?xml version="1.0" encoding="utf-8"?>


I have no idea why "xmlns" is causing problem here?